Apparatus for hoisting and crowding tractor bulldozers



APPARATUS FOR HOISTING AND CROWDING TRACTOR BULLDOZERS Filed April 3, 1935 5 Sheets-Sheet 1 LU u. fiwsmofig' 3Q 9- HUGH COYLE I -3 H ATTORNEY April 20,1937. COYLE 2,077,674

APPARATUS FOR HOISTING AND CROWD'ING TRACTOR BULLDOZERS Filed April 3, 1955 s She ets-Sheet 2 INVENTOR HUGH COYLE April 20, 1937. H. COYLE 2,077,674

APPARATUS FOR HOISTING AND CROWDING TRACTOR BULLDOZERS Filed April 3, 1955 3 Sheets-Sheet 3 INVENTOR BY HUGH cons ATTORNEY UNITED STATES PATENT OFFICE APPARATUS FOR HOISTI NG AND CROWD- ING TRACTOR BULLDOZERS Hugh Coyle, Seattle, Wash.

Application April 3, 1935, Serial No. 14,488

3 Claims. (c1. 121-46.5

This invention relates to hydraulic apparatus for operating scrapers or plows, and particularly for hoisting and lowering and crowding the same.

In the use of modern earth scrapers or plows of the type commonly called and known as bulldozers", designed to be attached to and pushed in front of tractors, it is important that they may be hoisted and. lowered or crowded" into various positions in relation to the surface to be graded.

It is also important that they be so shifted easily I and quickly by the operator of the tractor through one compact device.

It is therefore, an object of this invention to provide an hydraulic engine or apparatus for so hoisting, lowering and crowding the positions of such scrapers. Said apparatus provided with a means for distributing oil or other fluid under pressure to actuate pistons in cylinders for operating such scrapers and particularly for raising,

and lowering the same horizontally, and for raising or lowering either end thereof severally.

Another object is to provide a casing chamber, with a plurality of ports through opposite sides thereof, for receiving and discharging such fluid therethrough, under pressure to various points. Such chamber provided with a multiplex or core valve, rotatably mounted therein, and provided with a plurality of passageways therethrough, for receiving fluid from said ports and for conveying such fluid to other ports singly, or to several of said ports simultaneously, with grooves in the sides of such core valve adjoining and expanded from said passageways, for regulating and determining the flow of such fluid to and from such passageways. The sides of said core member between such grooves contacting with the chamber walls for blocking the flow of fluid except through such passageways as respectively desired. Such multiplex valve and ports for the purpose of directing the flow of such fluid to and from the opposite ends of pressure cylinders for raising and lowering the bulldozer and shifting the position thereof A further object is to provide a pressure valve for changing of the pressure of the liquid flowing therein while the pressure of the liquid thereto from a source of supply remains constant. Said pressure valve mounted in a tubular boss with a by-pass or auxiliary discharge passageway therefrom, to permit fluid to pass therethrough without being passed through such core valve. Said ressure-valve to be controlled by a spring to per- I it a discharge therefrom of fluid when the ports to the cylinders are closed, adapted to be reguated by the operator of the tractor when varying degrees of pressure are desired to be supplied to the cylinders.

I attain these and other objects by mechanism illustrated in the accompanying drawings, in which-- 5 Figure 1 shows a schematic perspective view of a caterpillar tractor, with a scraper plow or bulldozer attached, and apparatus positioned for operation,

Figure 2 is a sectional plan view of the lower 10 portion of the core valve and a fragmentary part of the, chamber casing, with the ways in position for hoisting the right hand side of the bulldozer,

Figure 3 is a fragmentary view of an end elevation of the parts shown in Figure 2, in the 15 same position,

Figure l is a sectional plan view of the lower portion of the core valve and part of the casing, with the ways in position [or hoisting both sides of the bulldozer simultaneously, 20

Figure 5 is a fragmentary view of a front elevation of parts of Figure 4,

Figure 6 is a sectional plan view of the lower portion of the core valve, and part of the casing, with ways in position for hoisting the left hand 25 side of the bulldozer, I

Figure 7 is a fragmentary view of a front elevation of a part of Figure 6,

Figure 8 is a plan view of the casing, for the core valve and pressure valve, 0

Figure 9 is a fragmentary view of a front and elevation of the casing showing four ports,

Figure 10 is a fragmentary view of a rear end elevation of the casing and tubular boss showing two ports, and handle for the pressure valve, 35

Figure 11 is a side elevation view, mostly in section, showing the core valve, ways, ports, and casing, and the pressure valve and assembly,

Figure 12 is a side elevation of the core valve showing diagonal passageway openings near the 40 center,

Figure 13 is a side elevation of the core valve taken from the left side of Figure 12, showing horizontal passageway openings near the center thereof, r

Figure 14 is a bottom plan of the core valve as shown in Figure 13,

Figure 15 shows a vertical section of the core valve along line I5--i5 of Figure 12, showing one diagonal passageway in full lines and the other 5 in dotted lines,

Figure 16 is a plan sectional view along lines l6l6 of Figure 13 showing diagonal passageways in dotted lines, and grooves in full'lines,

Figure 17 is a side elevation of the core valve 56 taken from the left side of Figure 13, with the top and bottom broken away showing diagonal passageway openings near the center.

Similar characters on the different figures re- 6 fer to similar parts.

Numeral I8 is a cylindrical casing with a tubular boss IS on the rear side thereof, and an ex tension boss 20, on the front side thereof.

Through the rear side of boss l3 are two ports 10 2| and 22, which are threaded at the outer ends for supply and discharge pipes M and E.

Through the boss 23 are four ports 232425- 26. a front cover plate 21 with ports to match those in boss 20 is afiixed to said boss 20 for connecting power and discharge pipes F, F, L,

and L. The plate 21 is for facility in construction, as the last mentioned pipes might be threaded directly into boss 23.

A base plate 36 is amxed by bolts 31 to the bottom of casing i8 and a cap plate 38 is affixed by bolts 33 to the top of easing it for enclosing a valve chamber l3. A multiplex or core valve 40, is rotatably mounted in the dosing chamber i8. This valve carries a guide shaft 41 on its lower end, which rests on a thrust washer 42, in a well 43 on the base plate 33. A screw 44 is threaded through the base-plate, and bears on the lower side of the thrust washer for adjusting the same. An operating shaft 45 extends from the top of valve and is provided with suitable stumng box, packing and connecting bolts assembled, indicated as 43. A crank 41, provided with a handle 41 is fastened to the top. of shaft 45, for changing the position of the multiplex or core valve. The valve last mentioned is provided with two horizontal passageways 48 and 43 therethrough, one above the other, which open into two horizontal grooves 50 and 5|, on one side of the valve, and open into two perpendicular grooves 52 and 53, on the other side of the valve.

A duct 28, extends between ports 2! and 22 in boss l3, and has seated across its upper end, a pressure valve 23. This valve is normally pressed down by a spring 30. An adjustable threaded spindle 3| compresses the spring, and is operated by a lever wheel 32 and handle 32'. The spindle is provided with a stufllng box 33 and packing 34 connected and retained by bolts 35. When the hand wheel 32 is turned so as to reduce the pressure of spring 30 sumclently on valve 23, this valve will lift, and permit a desired portion of the fluid from the pump toreturn without, it going through the core valve 40, and thus decrease the pressure in the cylinders. Meanwhile the pressure from the pump is un-' changed. Again when the valve 40 is turned in such position as to close all ports in the front end of the casing or boss 20, as often occurs when shifting the position of 40, then the pressure of the fluid will force the valve 29 to rise, and permit the full flow from the pump to return to the reservoir through the port 22. Two diagonal passageways 54 and 55 extend through valve 40 crosswise with the horizontal way 43 and 43, and crosswise to each other. The lower end of way 54 opens into a horizontal extension'or spur 51 of perpendicular groove 51 which has another horizontal spur 51". The upper end of way 54' In the position shown in Figure 11, the fluid flows into and through valve way 43, and through ports 23 and 24, and thence by connecting pipes F and L, to the head ends of the right and left hydraulic cylinders C respectively. The pistons D through the connecting rods G, bell crank H,

rod J, pivotally connected, raise and lower the scraper plow K.

The fluid in the crank end of the cylinders is forced out of the cylinders by the backing of the piston D, through the pipes L and F into the casing ports 25 and 23, thence through way 49 and out through casing port 22 and back through return pipe M, to the reservoir B. The last described position of the core valve is seen in Figures 4 and 5.

When the core valve is positioned as shown in Figures 2 and 3, the fluid still comes into passage way 48 through port 2| but goes out through port 23.only, and so works'only the right hand hydraulic cylinder piston, and the fluid returns through port 25 only. When the core valve is turned to position shown in Figures 6 and 7, the oil goes out through casing port 24 only, and works left side cylinder only and returns through casing port 28 only. 5

For further illustrations consider Figures 2 and 3. The oil of fluid is forced by the pump through port 2 I, through the right hand end of horizontal groove 50 into way 48, into port 52,-along the horizontal extension 52", through pipe F, (Fig. 1) into the head end of the cylinder C on the right hand side of the tractor, thereby forcing the piston D, towards the front end of the tractor, and by means of rod G, the bell crank lever H, and lever J, raising the right hand side of the bulldozer K. The return flow is from the crank end of the right hand cylinder through pipe L,'

port 25, groove 53", way 43, groove 5|, port 22, pipe M, to reservoir B.

Next considering Figures 4 and 5. In this position the oil or fluid is forced from the pump through the port 2|, through the center of the horizontal groove 50, through the passageway 43, through the vertical groove 52 and out of both ports 23 and 24, through-pipes L and F, which by their connections to the head ends of both the left and right cylinders, will raise both sides of the bulldozer together. Return flow from both sides is through pipes L and F, vertical groove 53, passageway 49, horizontal groove 5|, port 22, pipe M, to reservoir'B. Consider Figures 6 and '7. In this position the oil is forced through port 2|, through the left end groove 50 through the way 48, into the vertical groove 52, along the horizontal extension 52', out of port 24 through pipe L and to the head end of piston on the left side, thus raising the left side onlyof bulldozer K. Thereturn flow from the left cylinder, is through pipe F, horizontal spur '53, through way 43, horizontal groove 5|, port 22, pipe M to reservoir B.

The return flow of the oil from the cylinders in each case is through the ports and ways in the upper half of the core valve 40, which are in' For crowding purposes the horizontal groove 53 is lined up with port 2|, and the oil flow is through port 2|, through groove 53, up the diagonal passageway 55, and out of the groove 53, and out of port 25, or both 25 and'26, or 26 alone, and thence to the crank ends of the cylinders,

either the right hand or both, or to the left hand, which will force the right hand or both'sides or the left hand side of the bulldozer down.

For further explanation, it may be stated that 5 for crowding of the right hand side, the fluid passes through opening and members: pump A, pipe E, port 2|, horizontal groove 59, diagonal way55, horizontal spur 58", port 25, pipe L, to the crank end of the right hand cylinder 0. The return is through pipe F, port 23, horizontal spur 51", vertical groove 51, horizontal spur 51', diagonal way 54, horizontal groove 56, port 22,

pipe M, into B; I For crowding both sides simultaneously the fluid passes through openings and members: Pump A, pipe E, port 2|, 59, 55, 58, 25, and 25, pipes L, and F'f, to the crank ends of both the right hand and left hand cylinders. The return is from the right and left hand cylinders through pipes F and L, ports 23 and 24, 51, 54, 56, 22, pipe M to B. For crowding the left hand side only the fluid passes through openings and members: Pump A, pipe E, port 2|, 59, 55, 58", 58, 58, 26, F, to the crank end of the left hand cylinder and returns from the head end of the left hand cylinder through pipe L, port 24, 51", 54, 56, 22, pipe M to B.

It will be understood that the grooves and spurs connecting with the ends of the ways are necessary because of the plurality of the ports to be brought into connection with a fewer number of ways and also because the ways are necessarily built on different levels through the valve 40. Thus as constructed, the spurs permit a flow through the ways when the ways are'sometimes not in line with the given ports. It is necessary to close some of the ports when others are open, and these spurs and extensions provide for flows through the desired ports when others are so 4 closed, as clearly illustrated in Figures 3, 5, and '7.

In Figure 1, I have indicated a practical application of my hydraulic apparatus for shifting positions of a bulldozer. But parts of the plan as therein shown are diagrammatically arranged 45 for illustration, and may be departed from in some cases. Only one side of the tractor and mechanism for supporting the bulldozer and cylinder for elevating and lowering the same are fully shown, but the same mechanism is dupli- 5 cated on both sides thereof. The bulldozer K, is supported from its top center by ball U and movable socket D on the front end of a yoke W.

The yoke is connected by pivot N, to the rear end of the tractor, which permits either end of the 5 scraper to be raised or lowered severally. Push bars R, are attached to the yoke by pivots P, at their rear ends; and their front ends are pivotally connected to the respective ends of the bulldozer on pivot ears S, affixed to scraper K by rivets Y, 60 whereby the bulldozer may be pushed forward while at various angles to the surface to be scraped. The lower ends of the links J, are pivotally attached to a crossbar Z by pivots T,'near the bulldozer. A fulcrum pin h, affixed to the 65 tractor, supports the bell cranks H, pivotally, in

suitable position for raising and lowering the ends of the bulldozer when the pistons in the cylinders and rods therefrom actuate the cranks.

On the face of the cap 38, on the casing I8 is preferably positioned suitable lettering to indicate the proper positions of the valve lever 41, when the valve is to be turned to a desired point. A pointer 41" is extended from the lever to register with the letters and other desired lines.

Having described my invention, I claim:

1. An apparatus for directing the flow of liquids to various predetermined points, comprising a circular casing provided with a circular chamber therein, and provided with a plurality of ports through the opposite walls thereof, a circular valve rotatably mounted perpendicularly in the chamber, said valve provided with a plurality of horizontal passage ways therethrough parallel to each other, and a plurality of diagonal passageways therethrough crosswise to each other and crosswise to said horizontal passageways, said valve further provided with peripheral grooves connected severally with the ends of said passageways, for registering with said ports: respective, for receiving and directing flows of liquids through said ports respectively singly and plurally, with means for rotating said valve for the registration of said grooves and ports determine the destination of such fluid.

2. An hydraulic apparatus for raising and lowering a bulldozer scraper, comprising an oil reservoir connected with a pump and chamber for directing the flow of such oil to opposite ends of pressure cylinders, with means for changing the pressure in such cylinders, a chamber and core valve rotatably mounted therein, said chamber provided with two ports through the back wall thereof, and four ports through the front wall thereof, for the passage of fluid from the I pump through said chamber and for the return of such fluid to said-reservoir, said core valve provided with two parallel horizontal passageways therethrough, one above the other, and provided with two diagonal passageways therethrough crosswise to each other and to said horizontal ways, for the passage of fluid through said valve, with peripheral grooves on said valve adjacent the ends of said ways for registering with said ports, with means for rotating such valve to make and alter such registrations for directing the fluid.

3. In an hydraulic apparatus for shifting positions of a tractor bulldozer, comprising a tubular valve chamber, provided with ports through opposite sides thereof for entry and exit of fluids for operating the bulldozer, a valve rotatably mounted in said chamber and provided with a plurality of horizontal passageways therethrough and adapted to register with said ports, said valvefurther provided with a plurality of diagonal passageways therethrough at right angles tosaid horizontal passageways, grooves and spurs on the periphery of said valve extending from the ends of said diagonal passageways to register with said ports when said diagonal passageways are not in line therewith, to facilitate the flow of such fluids respectively between said ports and said diagonal passageway for operating said bulldozer, with means for rotating said valve.

COYLE. 

